Decolorization of reactive brilliant red X-3B by heterogeneous photo-Fenton reaction using an Fe-Ce bimetal catalyst
Decolorization of reactive brilliant red X-3B by heterogeneous photo-Fenton reaction using an Fe-Ce bimetal catalyst
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DOI：
10.1016/j.cattod.2007.06.019
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发表时间：
2007-08
期刊：
影响因子：
5.3
通讯作者：
Yu Zhang;Xiaomin Dou;Jian Liu;Min Yang;Liping Zhang;Y. Kamagata
中科院分区：
文献类型：
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作者：
Yu Zhang;Xiaomin Dou;Jian Liu;Min Yang;Liping Zhang;Y. Kamagata
以Fe-Ce氧化物水合物为非均相催化剂，在H2 O2和UV存在下对活性艳红X-3B进行脱色研究。结果表明，UV-Fe-Ce-H2 O2对染料的脱色率依次为UV-Fe 3 +-H2 O2> UV-H2 O2>UV-Fe-Ce≥Fe-Ce-H2 O2>Fe-Ce。在34 mgl-1H 2 O2、0.500gl-1Fe-Ce、36 W紫外光、pH 3.0的条件下，100 mgl-1X-3B在30 min内脱色率可达99%以上。在反应过程中溶解的Fe的最大值为1 mgl −1。当Fe 3 += 1 mgl-1时，UV-Fe-Ce-H2 O2体系的脱色率明显高于UV-Fe 3 +-H2 O2体系，表明Fe-Ce主要起多相催化作用。采用紫外-可见光谱、二阶导数光谱和离子色谱法研究了其降解途径。在多相催化氧化体系中，X-3B吸附后的快速降解是其主要机理。第一个降解步骤是偶氮和CN键的断裂，导致苯胺和苯酚类化合物的形成。然后，三嗪结构的断裂与萘环向多取代苯的转化以及萘环上磺酸基的切断一起发生。最后一步包括苯胺结构的进一步分解和X-3B的部分矿化。
Decolorization of reactive brilliant red X-3B was studied by using an Fe–Ce oxide hydrate as the heterogeneous catalyst in the presence of H2O2and UV. The decolorization rate was in the order of UV–Fe–Ce–H2O2>UV–Fe3+–H2O2>UV–H2O2>UV–Fe–Ce≥Fe–Ce–H2O2>Fe–Ce. Under the conditions of 34mgl−1H2O2, 0.500gl−1Fe–Ce, 36W UV and pH 3.0, 100mgl−1X-3B could be decolorized at efficiency of more than 99% within 30min. The maximum dissolved Fe during the reaction was 1mgl−1. From the fact that the decolorization rate of the UV–Fe–Ce–H2O2system was significantly higher than that of the UV–Fe3+–H2O2system at Fe3+=1mgl−1, it is clear that the Fe–Ce functioned mainly as an efficient heterogeneous catalyst. UV–vis, its second derivative spectra, and ion chromatography (IC) were employed to investigate the degradation pathway. Fast degradation after adsorption of X-3B is the dominant mechanism in the heterogeneous catalytic oxidation system. The first degradation step is the breaking down of azo and CN bonds, resulting in the formation of the aniline- and phenol-like compounds. Then, the breaking down of the triazine structure occurred together with the transformation of naphthalene rings to multi-substituted benzene, and the cutting off of sulphonic groups from the naphthalene rings. The last step includes further decomposition of the aniline structure and partial mineralization of X-3B.